<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Paginator
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Iterator.php 18951 2009-11-12 16:26:19Z alexander $
 */

/**
 * @see Zend_Paginator_Adapter_Interface
 */
require_once 'Zend/Paginator/Adapter/Interface.php';

/**
 * @category   Zend
 * @package    Zend_Paginator
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Paginator_Adapter_Iterator implements Zend_Paginator_Adapter_Interface
{
	/**
	 * Iterator which implements Countable
	 *
	 * @var Iterator
	 */
	protected $_iterator = null;

	/**
	 * Item count
	 *
	 * @var integer
	 */
	protected $_count = null;

	/**
	 * Constructor.
	 *
	 * @param  Iterator $iterator Iterator to paginate
	 * @throws Zend_Paginator_Exception
	 */
	public function __construct(Iterator $iterator)
	{
		if (!$iterator instanceof Countable) {
			/**
			 * @see Zend_Paginator_Exception
			 */
			require_once 'Zend/Paginator/Exception.php';

			throw new Zend_Paginator_Exception('Iterator must implement Countable');
		}

		$this->_iterator = $iterator;
		$this->_count = count($iterator);
	}

	/**
	 * Returns an iterator of items for a page, or an empty array.
	 *
	 * @param  integer $offset Page offset
	 * @param  integer $itemCountPerPage Number of items per page
	 * @return LimitIterator|array
	 */
	public function getItems($offset, $itemCountPerPage)
	{
		if ($this->_count == 0) {
			return array();
		}

		return new LimitIterator($this->_iterator, $offset, $itemCountPerPage);
	}

	/**
	 * Returns the total number of rows in the collection.
	 *
	 * @return integer
	 */
	public function count()
	{
		return $this->_count;
	}
}